Electric wave propagation characteristic estimation system, method thereof, and program
Abstract
For a large cover region of a radio system to be estimated, there are provided an electric wave propagation characteristic estimation system and its method for rapidly and accurately estimating electric wave propagation characteristic in a part of the cover region to be investigated. When a transmission source and an investigation object region to be subjected to check of the propagation environment of an electric wave irradiated from the transmission source are given in a 3D region containing a plurality of contents, and an electric wave propagation environment in the investigation object region is to be estimated, electric wave propagation rough sketch acquisition means (10) determines an electric wave propagation rough sketch in the investigation object region or in the vicinity of it. Pseudo transmission source preparation means (20) prepares finite pseudo transmission sources for simulating the electric wave propagation rough sketch and electric wave propagation estimation means (30) performs detailed electric wave propagation estimation by using the finite pseudo transmission sources as new transmission sources and an analysis region including the investigation object region as an analysis object.

Term
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25 claims: 8 independent, 17 dependent
- 1請求の範囲 [1] 複数の内容物が存在する 3次元の領域内において、送信源と、前記送信源から放 射される電波の伝搬環境を調べる対象となる調査対象領域とが与えられ、前記調査 対象領域での電波伝搬環境を推定する電波伝搬特性推定システムであって、 前記調査対象領域内または近傍における電波伝搬概況を求める第 1の手段と、前 記電波伝搬概況を模擬するための有限の擬似送信源を準備する第 2の手段と、前 記有限の擬似送信源を新たな送信源とし、前記調査対象領域を含む解析領域を解 析対象として詳細な電波伝搬推定を行う第 3の手段とを含むことを特徴とする無線通 信システムにおける電波伝搬特性推定システム。
- 2[2] 前記第 1の手段は、前記電波伝搬概況として、前記調査対象領域内または近傍に 配置された観測点における受信電力を求めることを特徴とする請求項 1に記載の電 波伝搬特性推定システム。
- 3[3] 前記解析領域は、前記調査対象領域のほか、前記調査対象領域の周りの複数の 内容物が含まれるように設定され、前記擬似送信源は、前記解析領域の外側で、前 記送信源と前記調査対象領域とを結ぶ線上付近に準備されることを特徴とする請求 項 2に記載の電波伝搬推定システム。
- 4[4] 前記解析領域は、前記調査対象領域と同一に設定され、前記擬似送信源は、前 記調査対象領域の周囲に準備され、前記調査対象領域周辺の内容物の配置状況 によって、前記擬似送信源の送信電力を決定することを特徴とする請求項 2に記載 の電波伝搬推定システム。
- 5[5] 前記第 1の手段は、前記電波伝搬概況として、前記調査対象領域内または近傍に 配置された観測点において、電波到来方向と、前記電波到来方向に対応する受信 電力とを求めることを特徴とする請求項 1に記載の電波伝搬特性推定システム。
- 6[6] 前記解析領域は、前記調査対象領域と同一に設定され、前記擬似送信源は、前 記観測点から前記電波到来方向へと延びる線上付近に準備されることを特徴とする 請求項 5に記載の電波伝搬特性推定システム。
- 7[7] 前記第 1の手段は、前記電波伝搬概況として、前記調査対象領域内または近傍に 配置された観測点にぉ 、て、各マルチパス成分の受信電力と電波到来方向と電波 到来時間とを求めることを特徴とする請求項 1に記載の電波伝搬特性推定システム。
- 8[8] 前記解析領域は、前記調査対象領域と同一に設定され、前記擬似送信源は、前 記観測点から前記電波到来方向へと延びる線上付近に準備し、前記第 3の手段に おいて電波伝搬推定を行う際に、前記電波到来時間に相当する遅延を考慮すること を特徴とする請求項 7に記載の電波伝搬特性推定システム。
- 9[9] 前記第 3の手段における電波伝搬推定に、レイトレーシング法を用いることを特徴と する請求項 1に記載の電波伝搬特性推定システム。
- 10[10] 前記第 1の手段において電波伝搬概況を求めるために、統計論的手法を用いるこ とを特徴とする請求項 1に記載の電波伝搬特性推定システム。
- 11[11] 前記第 1の手段において電波伝搬概況を求めるために、レイトレーシング法を用い ることを特徴とする請求項 1に記載の電波伝搬特性推定システム。
- 12[12] 前記第 1の手段において電波伝搬概況を求めるために、実測定を用いることを特 徴とする請求項 1に記載の電波伝搬特性推定システム。
- 13[13] 複数の内容物が存在する 3次元の領域内において、送信源と、前記送信源から放 射される電波の伝搬環境を調べる対象となる調査対象領域とが与えられ、前記調査 対象領域での電波伝搬環境を推定する電波伝搬特性推定方法であって、 前記調査対象領域内または近傍における電波伝搬概況を求める第 1のステップと、 前記電波伝搬概況を模擬するための有限の擬似送信源を準備する第 2のステップと 、前記有限の擬似送信源を新たな送信源とし、前記調査対象領域を含む解析領域 を解析対象として詳細な電波伝搬推定を行う第 3のステップとを含むことを特徴とする 無線通信システムにおける電波伝搬特性推定方法。
- 14[14] 前記第 1のステップにお!/、て、前記電波伝搬概況として、前記調査対象領域内また は近傍に配置された観測点における受信電力を求めることを特徴とする請求項 13に 記載の電波伝搬特性推定方法。
- 15[15] 前記解析領域は、前記調査対象領域のほか、前記調査対象領域の周りの複数の 内容物が含まれるように設定され、前記擬似送信源は、前記解析領域の外側で、前 記送信源と前記調査対象領域とを結ぶ線上付近に準備されることを特徴とする請求 項 14に記載の電波伝搬推定方法。
- 16[16] 前記解析領域は、前記調査対象領域と同一に設定され、前記擬似送信源は、前 記調査対象領域の周囲に準備され、前記調査対象領域周辺の内容物の配置状況 によって、前記擬似送信源の送信電力を決定することを特徴とする請求項 14に記載 の電波伝搬推定方法。
- 17[17] 前記第 1のステップにお!/、て、前記電波伝搬概況として、前記調査対象領域内また は近傍に配置された観測点において、電波到来方向と、前記電波到来方向に対応 する受信電力とを求めることを特徴とする請求項 13に記載の電波伝搬特性推定方 法。
- 18[18] 前記解析領域は、前記調査対象領域と同一に設定され、前記擬似送信源は、前 記観測点から前記電波到来方向へと延びる線上付近に準備されることを特徴とする 請求項 17に記載の電波伝搬特性推定方法。
- 19[19] 前記第 1のステップにお!/、て、前記電波伝搬概況として、前記調査対象領域内また は近傍に配置された観測点にぉ 、て、各マルチパス成分の受信電力と電波到来方 向と電波到来時間とを求めることを特徴とする請求項 13に記載の電波伝搬特性推定 方法。
- 20[20] 前記解析領域は、前記調査対象領域と同一に設定され、前記擬似送信源は、前 記観測点から前記電波到来方向へと延びる線上付近に準備し、前記第 3の手段に おいて電波伝搬推定を行う際に、前記電波到来時間に相当する遅延を考慮すること を特徴とする請求項 19に記載の電波伝搬特性推定方法。
- 21[21] 前記第 3のステップにおける電波伝搬推定に、レイトレーシング法を用いることを特 徴とする請求項 13に記載の電波伝搬特性推定方法。
- 22[22] 前記第 1のステップにおいて電波伝搬概況を求めるために、統計論的手法を用い ることを特徴とする請求項 13に記載の電波伝搬特性推定方法。
- 23[23] 前記第 1のステップにおいて電波伝搬概況を求めるために、レイトレーシング法を 用いることを特徴とする請求項 13に記載の電波伝搬特性推定方法。
- 24[24] 前記第 1のステップにおいて電波伝搬概況を求めるために、実測定を用いることを 特徴とする請求項 13に記載の電波伝搬特性推定方法。
- 25[25] 複数の内容物が存在する 3次元の領域内において、送信源と、前記送信源から放 射される電波の伝搬環境を調べる対象となる調査対象領域とが与えられ、前記調査 対象領域での電波伝搬環境を推定する方法をコンピュータにより実行させるための プログラムであって、 前記調査対象領域内または近傍における電波伝搬概況を求める処理と、前記電 波伝搬概況を模擬するための有限の擬似送信源を準備する処理と、前記有限の擬 似送信源を新たな送信源とし、前記調査対象領域を含む解析領域を解析対象として 詳細な電波伝搬推定を行う処理とを含むことを特徴とするコンピュータ読み取り可能 なプログラム。
Independent claims25
112 paragraphs in 1 section, as filed
0001Specification
0002An electric wave propagation characteristic presumption system, a method for the same, and a program
0003Technical field
0004[0001] When the cover field of the radio system which the present invention relates to the system which presumes an electric wave propagation characteristic, and serves as especially a candidate for presumed covers a wide area, Some subject-of-search territories in the cover field Electric wave propagation characteristic presumption Si for presuming the electric wave propagation characteristic in a region at high speed and with high precision It is related with a stem.
0005Background art
0006[0002] It is electric wave Propagation feature in order to give arrangement of the base station in a radio communications system, a main phone, etc. A sex presumption system (electric wave propagation simulator) is used. For this electric wave propagation simulator The received power in an intermediary and arbitrary receiving points and a delay spread are evaluated and carried out, and it is Establishment of a Should transmitting station. The increase in efficiency of reduction of the number of base stations which should determine a place place and should be arranged as a result, etc. is attained.
0007[0003] what divides an electric wave propagation simulation roughly and is depended on a statistical method, and deterministic approach There is To. It is a technique determined by a multivariate analysis etc. based on De of a large number obtained by real measurement of the propagation loss when giving the estimate equation of the propagation loss which makes distance, frequency, etc. an argument in a statistical method and determining the parameter - Tha. Generally, propagation of an electric wave is structure. It is statistics Theoretical hand although changed in section by the reflection and the penetration in a thing, an indoor object, etc. According to the method, the median of section change is given.
0008[0004] It is the technique of deterministic approach Well and The, considering the electric wave to which antenna power is also emitted to be a gathering on many electric wave lines (Ray) on the other hand, compounding the lei which arrives at a station as that in which each lei repeats and spreads a reflective penetration in geometric optics, and calculating a propagation loss and a delaying amount. This technique It is called the ray tracing method. a structure actual in the ray tracing method -- anti- -- Since the influence of a Shooting penetration and diffraction is taken into consideration, the section change in a station itself can be known. To.
0009[0005] The ray tracing method is further divided roughly into the lei Running method and the imaging method. Les The Iranching method emits a lei discretely at a given fixed angle from a transmitting antenna, and is the Trace. It is the technique of considering that the lei which carried out sequential pursuit of the marks and passed through near the receiving point is the lei which reached the receiving point concerned.
0010[0006] On the other hand, the imaging method is the technique of determining the reflective penetration course of a lei of connecting between the points receiving [ transmit and ], in quest of the reflection point over a reflective surface. The point receiving [ transmit and ] and a reflective penetration thing a reflective penetration course Since it can be uniquely found when specified, with the imaging method, it is a propagation path of a strict lei. It can search. It compares about the details of the lei Runching method imaging method. It is indicated by The and patent documents 1.
0011Patent documents 1: Provisional Publication No. 9 -- No. 33584 gazette
0012The indication of an invention
0013Object of the Invention
0014[0007] On the other hand, grasp of Accompany! and the electric wave propagation situation of a cellular system is important for spread expansion of a mobile phone in recent years. In particular, these days, it connects with the usual public line at the extension telephone in a company. The service form of using the same terminal as the portable telephone terminal to carry out is examined. Such are . Under a situation, the electric wave from an outdoor base station is to the inside of a certain building in the cover field. Does it leak however? It is necessary to grasp correctly. It is an electric wave propagation simulator about this. Some subject-of-search fields which are in the cover field of the electric wave from a base station when realizing It receives and the art of presuming electric wave propagation environment at high speed and with high precision is needed. Deer No above-mentioned conventional technologies can satisfy this demand, carrying out.
0015[0008] Explain the problem of conventional technology, referring to figure 1 1 figure 4. Figure In the field shown in 1, the structure of a large number, such as a building and a road, is arranged. In the inside of each building, it is furniture. The object of a large number, such as fixtures, is arranged. Here, it is an outdoor base station of the lower part of a figure. Subject-of-search territory which considers it as source 1 of transmission of a radio system, and is the target of propagation presumption of the building above a figure It is considered as region 2. Under the present circumstances, it is Inference at high speed and with high precision about the electric wave propagation environment in subject-of-search field 2. The technique for [ constant ] carrying out is considered.
0016[0009] a figure -- 2 is a key map of electric wave propagation presumption which used the statistical method. In this technique, it is based on the inclination of the geographical feature from source 1 of transmission to subject-of-search field 2, the density of a building, etc., and is a propagation loss. Also which an estimate equation is given and presumes the received power in subject-of-search field 2 with this estimate equation It is that. By the technique for getting to know the median of section change, as this technique was described also in advance It is. To therefore, the wall and indoor object in the inside of subject-of-search field 2, or its neighborhood The influence which an intermediary electric wave receives cannot be made to reflect correctly. Therefore, a subject-of-search field
0017Electric wave propagation environment of 2 cannot be presumed with high precision.
0018[0010] a figure -- 3 is a key map of electric wave propagation presumption which used the lei Running method. The lei by which transmitting Source force was also discretely emitted at a given fixed angle in this technique is a geometric optics target in a structure. That course is pursued as what is spread while repeating reflection and a penetration. Since the influence of each structure, an indoor object, etc. is correctly reflected in this technique, it is quantity. Accuracy electric wave propagation presumption is possible. The case where the field which is carried out, and is analyzed while carrying out power is large, and solution When many contents are in the field which carries out Analysis, computation time will increase. In order to be concerned with the position of field 2 for Tone * and to emit a lei that there is nothing, it does not pass through subject-of-search field 2. Even a lei will calculate. Thereby, the problem that big futility arises is also in calculation.
0019[0011] a figure -- 4 is a key map of electric wave propagation presumption which used the imaging method. this technique -- oh, in order to look for a lei after setting up the point receiving [ Strength ], there is no problem of calculation of the useless lei currently mentioned by the lei Running method. It carries out, and the imaging method itself also receives the inside power of all the combination in the reflective surface and the diffracting point of and all the contents, carrying out power. Since it is the technique of Searching(ing) the lei which reaches a point, the reflective surface and the diffracting point of a content increase. When it carries out, there is a fault that computational complexity increases exponentially. Every receiving point Since it is necessary to look for a lei, when subject-of-search field 2 is a wide area to some extent, he is To et al. Much computation time will be required. For this reason, computation time becomes huge and is a too high-speed intermediary. Estimation is unrealizable.
0020[0012] When the cover field of the radio system used as the candidate for presumed crosses the object of the present invention to a wide area, the electric wave propagation characteristic in some subject-of-search fields in the cover field -- a high speed -- and -- An electric wave propagation characteristic presumption system for presuming with high precision, a method for the same, and Prodara It is providing Beam.
0021Means for solving problem
0022The present invention is [0013]. As for an electric wave propagation characteristic presumption system by the present invention, a plurality of contents exist. Inside of a three-dimensional field is characterized by comprising: A source of transmission, Object which investigates propagation environment of an electric wave emitted from the above-mentioned source of transmission A becoming subject-of-search field is given and electric wave propagation environment in the above-mentioned subject-of-search field is presumed. Electricity [ in / it is an electric wave propagation characteristic presumption system, and / the inside of the above-mentioned subject-of-search field, or the neighborhood ] 1st means to search for wave propagation general condition False [ for imitating the above-mentioned electric wave propagation general condition / limited ] The which prepares a source of transmission Two means Above-mentioned limited source of false transmission is made into the new source of transmission, and is described above. The which performs electric wave propagation presumption detailed as a candidate for analysis for an analysis field including a subject-of-search field Three means
0023The present invention is [0014]. As for an electric wave propagation characteristic estimation method by the present invention, a plurality of contents exist. Three-dimensional field Inside is characterized by comprising: A source of transmission, Object which investigates propagation environment of an electric wave emitted from the above-mentioned source of transmission A subject-of-search field is given and electric wave propagation environment in the above-mentioned subject-of-search field is presumed. Electric wave intermediary [ in / it is an electric wave propagation characteristic estimation method, and / the inside of the above-mentioned subject-of-search field, or the neighborhood ] The which asks for General condition Step of 1 False [ for imitating the above-mentioned electric wave propagation general condition / limited ] The which prepares a source of transmission Two steps Before making above-mentioned limited source of false transmission into the new source of transmission The which performs electric wave propagation presumption detailed as a candidate for analysis for an analysis field including an account subject-of-search field Three steps.
0024[0015] In the program by the present invention, a plurality of contents exist. [ in a three-dimensional field ], Subject-of-search territory used as the object which investigates the propagation environment of the electric wave emitted from the source of transmission, and the above-mentioned source of transmission A region is given, It is pair you about the method of presuming the electric wave propagation environment in the above-mentioned subject-of-search field. In order to make it perform by Tha, it is a program, and it can set to the inside of the above-mentioned subject-of-search field, or the neighborhood. Processing which searches for Radio waves propagation general condition, False [ for imitating the above-mentioned electric wave propagation general condition / limited ] The above-mentioned limited source of false transmission is made into the new source of transmission with the processing which prepares the source of transmission, and it is the above-mentioned investigation pair. This including the processing which performs electric wave propagation presumption detailed as a candidate for analysis for an analysis field including an elephant field It is considered as the feature.
0025[0016] Describe an operation of the present invention. A plurality of contents exist. Subject-of-search field used as the object which investigates the propagation environment of the electric wave emitted from the source of transmission, and this source of transmission in a three-dimensional field It is given, When presuming the electric wave propagation environment in this subject-of-search field, it is a subject-of-search field. The electric wave propagation general condition in inside or the neighborhood is searched for, In order to imitate this electric wave propagation general condition The limited source of false transmission is prepared, the source of these limited false transmission is made into the new source of transmission, and it is an investigation pair. An analysis field including an elephant field is constituted so that electric wave propagation presumption detailed as a candidate for analysis may be performed.
0026[0017] When asking for the received power in the station arranged in the neighborhood in a subject-of-search field as an electric wave propagation general condition, When asking for the arrival directions of an electric wave, and the received power corresponding to it The case where the received power, electric wave arrival directions, and electric wave arrival time of each multipass ingredient are found is Behavior. To be. According to the present invention, the source of false transmission is received to each above-mentioned case. A suitable parameter is given.
0027[0018] When performing detailed electric wave propagation presumption, it is preferred to perform electric wave propagation presumption of the above-mentioned analysis field using the ray tracing method. By using the ray tracing method, the content a subject-of-search field and near the subject-of-search field is appropriately taken into consideration, and it is highly precise electric wave propagation presumption. It can carry out. As the technique of searching for electric wave propagation general condition, they are the statistics theory technique and Rejto. Various techniques, such as the racing method and real measurement, are applicable. for example, source of transmission , -- the case where many contents have an electric wave range of access within the limits of extensive Scum -- computation time using few and the statistics theory technique -- good -- better --
0028[0019] On the other hand, it is preferred to use ray tracing to presume the electric wave propagation environment in a subject-of-search field with high precision. Fruit in the inside of a subject-of-search field, or the neighborhood When it can measure easily, electric wave propagation general condition may be searched for by real measurement.
EFFECT OF THE INVENTION
0030[0020] according to the present invention, the cover field of a radio system presumes section change of electric wave propagation environment at high speed and with high precision only about some of the subject-of-search fields in extensive ! and a field It is effective in the ability to do.
0031Brief explanation of the drawings
0032[0021] [Drawing 1] It is a figure for explaining the electric wave propagation presuming method.
0033[figure 2] It is a key map of electric wave propagation presumption using the statistics theory technique which is prior art.
0034[figure 3] It is a key map of electric wave propagation presumption using the lei Running method which is prior art.
0035[figure 4] It is a key map of electric wave propagation presumption using the imaging method which is prior art.
0036[figure 5] It is an outline functional block diagram of an embodiment of the invention.
0037[figure 6] It is a flow chart which shows the outline of operation of an embodiment of the invention.
0038[figure 7] It is a figure for explaining operation of an embodiment of the invention.
0039[figure 8] It is a flow chart which shows operation of the example of The 1 of the present invention.
0040[figure 9] It is a figure showing extraction of the extracted station with the analysis field in the example of The 1.
0041[figure 10] It is a figure showing arrangement of the source of false transmission in the example of The 1. * It is a flow chart which shows operation of the example of The 2 of the * 12] present invention which is a figure showing electric wave propagation presumption by the lei Running method in the example of 11] The 1.
0042* It is a figure showing arrangement of the source of false transmission in the * 14] 2nd example which is a figure showing extraction of the extracted station with the analysis field in the example of 13] The 2.
0043* In the figure for explaining the determination of the transmission power of the source of false transmission in the example of 15] The 2 It is.
0044[figure 16] *17] which is a figure showing electric wave propagation presumption by the lei Running method in the example of The 2 It is a flow chart which shows operation of the example of The 3 of the present invention.
0045[figure 18] The analysis field in the example of The 3, and subject-of-search territory divided into a plurality of blocks It is a figure showing the outer wall of a region.
0046* It is a figure showing extraction of the station in the example of 19] The 3.
0047* It is a figure showing arrangement of the source of false transmission in the example of 20] The 3.
0048[figure 21] *22] which is a figure showing electric wave propagation presumption by the lei Running method in the example of The 3 It is a flow chart which shows operation of the example of The 4 of the present invention.
0049* It is a figure showing extraction of the station in the example of 23] The 4.
0050* It is a figure showing arrangement of the source of false transmission in the example of 24] The 4.
0051[figure 25] It is a figure showing electric wave propagation presumption by the lei Running method in the example of The 4.
0052[figure 26] It is a flow chart which shows operation of the example of The 5 of the present invention.
0053* It is a figure showing extraction of the station in the example of 27] The 5.
0054* It is a figure showing arrangement of the source of false transmission in the example of 28] The 5.
0055[figure 29] It is a figure showing electric wave propagation presumption by the lei Running method in the example of The 5. Explanations of letters or numerals [0022] 10 electric-wave propagation general-condition acquisition means
005620 Source Preparation Means of False Transmission
005730 Electric Wave Propagation Estimation Means
005840 Control Part (CPU)
005950 Memory
0060The best form for inventing
0061[0023] Describe an embodiment of the invention to it, referring to drawings to below. Figure 5 is a functional block diagram showing the outline of an embodiment of the invention. the system of this embodiment -- double -- The content of a number exists. [ in a three-dimensional field ] from the source of transmission, and this source of transmission -- radiation -- The subject-of-search field used as the object which investigates the propagation environment of a To be electric wave is given. the subject of search concerned it is an electric wave propagation characteristic presumption system which presumes the electric wave propagation environment in a field -- this system -- and a figure -- it is shown in 5 -- as -- electric wave propagation general-condition acquisition means 10, source preparation means 20 of false transmission, and electric wave It is constituted including propagation estimation means 30, control part 40, and memory 50.
0062[0024] Electric wave propagation general-condition acquisition means 10 has the function to search for the electric wave propagation general condition in the inside of a subject-of-search field, or the neighborhood. Source preparation means 20 of false transmission is to electric wave propagation general-condition acquisition means 10. Function to prepare the limited source of false transmission for imitating It was sought electric wave propagation general condition It has. electric wave propagation estimation means 30 was prepared by source preparation means 20 of false transmission -- limited Full considering the analysis field which makes the source of false transmission the new source of transmission, and includes a subject-of-search field as a candidate for analysis It has the function to perform thin electric wave propagation presumption. control part 40 -- each of these means 10 -- It is control about 30. it is CPU to carry out and memory 50 functions as a memory for work of this CPU -- both -- CPU a procedure of operation -- oh, it stores as a Strength program.
0063[0025] a figure -- 6 -- a figure -- it is a flow chart which shows the outline of operation of 5 -- a figure -- It was 7 explains the outline to be Because -- it is a figure. Figure An outdoor base station is made into source 1 of transmission of a radio system in the field to which the structure of a large number, such as a building, a road, etc. as shown in 1, is arranged, and it is with subject-of-search field 2 about a certain building. It carries out. First, in electric wave propagation general-condition acquisition means 10, they are inside of subject-of-search field 2, or its Near. Near rough electric wave propagation environment is grasped (Step Sl). this rough electric wave propagation environmental grasp -- others, such as the well-known statistics theory technique and the ray tracing method, -- real -- Measurement Which technique can be used. [0026] Next, electric wave propagation environment acquired at Go and Step S1 by source preparation means 20 of false transmission The source of imitation transmission for imitating is prepared (Step S2). It investigates as this source of imitation transmission. One or more sources 100 (refer to Drawing 7) of imitation transmission are arranged on the outside of an object field. To Make applicable to analysis analysis field 3 (refer to Drawing 7) which includes subject-of-search field 2 for source 100 of imitation transmission as a new source of transmission in electric wave propagation estimation means 30 after cutting, and it is detailed electric wave propagation. It will presume (Step S3). In electric wave propagation presumption at this time, it is well-known Rey Tracy. The Tongue method is used.
0064[0027] In order to understand better the embodiment mentioned above, describe an example, referring to a concrete example below.
0065Example 1
0066[0028] Describe the example of The 1 of the present invention. the field assumed in this example, the source of transmission of a radio system, and a subject-of-search field -- a figure -- it is considered as the same thing as what was shown in 1. a figure -- 8 -- this example it is a flow chart which shows operation -- a figure -- 9 expresses analysis field 3 in this example -- subject-of-search field 2 is also included inside analysis field 3. To the extraction method of analysis field 3 It relates and mentions below.
0067[0029] Arrange station 20 in subject-of-search field 2 first in this example (Step Sl l).
0068Station 20 is I will even if it will be arranged in which position, if it is inside of a subject-of-search field, or the neighborhood. There is nothing. next, station 20 of the electric wave emitted from source 1 of transmission using the statistics theory technique -- It asks for the received power to kick (Step S12). Received power which was able to be found here is set to Pr_20.
0069[0030] And extract analysis field 3 (Step S13). In this example, it is with analysis field 3. It carries out, and unites and extracts subject-of-search field 2, and the building and road near the subject-of-search field 2. Candidate for analysis at the time of an analysis field performing detailed electric wave propagation presumption in a next step It becomes. As a candidate for analysis, it is estimation precision whether structures other than a subject-of-search field are included however. Increase of improvement and computation time is started. They are many when there are many structures included in an analysis field. Although computation time is required, the influence of reflective of the electric wave by a building is reflected more correctly. Figure In the example of 9, 1 block including the building near the subject-of-search field is adopted as analysis field 3. ing.
0070[0031] Next, arrange the source of false transmission for imitating the electric wave propagation environment searched for by step S 12 (Step S14). Figure Source [ in / to 10 / this example ] 101 of false transmission -- which shows arrangement of 103. Arrival directions of an electric wave when the source of false transmission assumes free space like this example It is preferred to take into consideration and to arrange near the line top which connects source 1 of transmission and station 20. Pseudo It is alike and, as for the source of transmission, arranging on the outside of analysis field 3 is preferred. Simulated sending arranged on the other hand Even if the number of Source is single, and it is plurality, it is not cared about. it is arrangement about a plurality of sources of false transmission in carrying out, also in each false transmitting Source force, all the distance to station 20 turns into the same distance -- as -- Arranging is preferred. this example -- a figure -- it is shown in 10 -- as -- three source of false transmission 1011 -- 103 is arranged in the position of distance d from station 20.
0071[0032] Next, determine the transmission power of the arranged source of false transmission (Step S15). source 10 of false transmission 11 -- the transmission power (Pt_n; n = 101, 102, 103) of 103 is given by the following formulas.
0072Pt_n =Pr -- 20Z {N * Loss (d)} .... (1)
0073Here, N is a total of the source of false transmission to arrange, and is N = 3 in this example. Loss (d) is source 101 of false transmission from station 20. -- Propagation loss in the propagation environment of a before [ 103 ] It is Loss and can be found with the statistics theory technique.
0074[0033] Next, source 101 of false transmission arranged by step S 14 -- 103 is made into the new source of transmission, and electric wave propagation presumption is performed for analysis field 3 (Step S 16). Figure The key map of electric wave propagation presumption at this step S16 is shown in 11. At this example, it is high energy about the propagation environment of subject-of-search field 2. In order to presume to a degree, the lei Running method which is one of the ray tracing methods is used. Also, source 101 of false transmission -- About the radial direction of the lei emitted from 103, it is only in analysis field 3. It limits.
0075[0034] Furthermore, the object arranged inside a building except subject-of-search field 2 ignores, and takes into consideration only reflection by the outer wall of a building. Obuji in the inside of buildings other than subject-of-search field 2 Since the electric wave propagation characteristic in subject-of-search field 2 is hardly affected, A project is presumed energy. High-speed Y of sacrificing-degree Without computation time is realizable. On the other hand, about the inside of subject-of-search field 2, the layout information inside a building is also taken into consideration, and electric wave propagation presumption is performed. Thereby, it is quantity about highly precise electric wave propagation presumption taken into consideration to the wall and indoor object of subject-of-search field 2. It is realizable for Fast.
0076Example 2 The example of The 2 of the [0035] present invention is described. the field assumed in this example, and radio System the source of transmission of Beam, and a subject-of-search field -- a figure -- it is considered as the same thing as what was shown in 1. Figure 12 is this example. It is a flow chart which shows operation. Figure 13 expresses analysis field 3 in this example. To. In this example, analysis field 3 is the same as subject-of-search field 2. About the extraction method of analysis field 3, it mentions below.
0077[0036] Step S21 and S22 are the same as that of Step Sl l in the example of The 1, and S12 in this example, arrange station 20 in subject-of-search field 2, and it is a statistics theory about the received power in the position. It presumes with the-like technique. Received power which was able to be found here is set to Pr_20.
0078[0037] Next, extract analysis field 3 (Step S23). In this example, it is with analysis field 3. It carries out and extracts the same field as subject-of-search field 2. Solution [ in / by making analysis field 3 the same as that of field 2 for Tone * like this example / electric wave propagation presumption at subsequent steps ] Since Target for analysis can minimize, there is little computation time and it ends. On the other hand, investigation In order to make the effect of the reflection and diffraction by the building and road near the object field 2 reflect correctly It is necessary to devise arrangement of the source of false transmission, and those transmission power determination.
0079[0038] Next, arrange the source of false transmission for imitating the electric wave propagation environment searched for at Step S22 (Step S24). In under the present circumstances, the position which detached only distance also with constant outer wall power of a subject-of-search field It is preferred to arrange the source of false transmission. a figure -- source [ in / to 14 / this example ] 101 of false transmission -- 1 -- arrangement of 124 is shown.
0080[0039] Determine the transmission power of each source of false transmission according to the arrangement situation of the surrounding structure of Continuing , The, and subject-of-search field 2 (Step S 25). Source 101 of false transmission -- The transmission power (P t_n;n= 101 -- 124) of 124 is given by the following formulas.
0081Pt_n =a_n * Pr -- 20Z {N * Loss (d)} .... (2)
0082The second half portion of the right-hand side of (2) types is the same as that of the right-hand side of (1) type in the example of The 1 here, and it is Ah. To. On the other hand, at this example, it is in the arrangement situation of the direction of source 1 of transmission, and a surrounding structure. Parameter which gives The weight attachment<sub>a</sub>_n is introduced. Large number from which a_n was obtained by real measurement Based on data, a suitable numerical value is given according to a situation.
0083[0040] a figure -- describe an example of the method of determining parameter a_n using 15. It is vertical course amendment value K_al to a road right-angled in the direction which generally connects with the statistics theory technique of propagation presumption a road parallel to the direction which connects the source of transmission, and a station, and the source of transmission and a station, respectively. [dB] and horizontal course amendment Value K_ac [dB] is given. These difference is set to K. On the other hand, it is a pile of a subject-of-search field. Angle between the directions which connect a direction, and the source of transmission and station to source n of false transmission from heart 41 If theta_n, a_n can be approximated by the following formulas.
0084a -- n =Kcos, theta -- n {3
0085[0041] moreover -- when considering the character of electric wave propagation the structure is close around subject-of-search field 2, the electric wave from [ the ] a structure is blocked by the structure -- subject-of-search field 2 -- Arrival reaching -- << -- it becomes. The source of false transmission which exists in the direction of the proximity structure when there is a structure thing close to the outer wall of subject-of-search field 2, in order to take this into consideration (this example) False transmission Source 108 -- To 117, it is a statistical method about the loss of the part which penetrates the approaching building. It computes and adds the loss of the part to a_n.
0086[0042] As a deciding method of a n, some techniques can be considered besides the above. For example, big shadow to a propagation characteristic to the circumference of a subject-of-search field in which the subject-of-search field is distant from the source of transmission When the building which gives sound does not exist, the arrival directions of a Move towards electric wave to a subject-of-search field It can be regarded as which direction power peach regularity. In such a case, it is as a_n = 1 simply. It does not interfere.
0087[0043] Next, source 101 of false transmission arranged at Step S24 -- 124 is made into the new source of transmission, and electric wave propagation presumption is performed for analysis field 3 (Step S 26). Figure The key map of electric wave propagation presumption at this step is shown in 16. Lei launch which is one of the ray tracing methods in this example as well as the example of The 1 in order to presume the propagation environment of subject-of-search field 2 with high precision The Tongue method is used. Source 101 of false transmission -- About the radial direction of the lei emitted from 124, it is a solution. It limits only in Precipitation area 3.
0088[0044] On the other hand, also take into consideration the layout information of subject-of-search field 2 inside, and perform electric wave propagation presumption. Highly precise electric wave propagation presumption taken into consideration to the wall and indoor object of Ri and subject-of-search field 2 is realizable at high speed.
0089[0045] In addition at the example of The 1 and the example of The 2 which were mentioned above, they are step S 12 and Steps. By A S22, when presuming received power Pr_20 of station 20, the statistics theory electric wave presuming method is used. It was, Besides this, you may ask for the received power of station 20 by real measurement. Example 3
0090[0046] Describe the example of The 3 of the present invention. this example -- !, the field which Assumed, the source of transmission of a radio system, and a subject-of-search field -- a figure -- it is considered as the same thing as what was shown in 1. Figure 17 is this example. It is a flow chart which shows operation. In this example, analysis field 3 is a subject-of-search territory. It is the same as that of region 2. About the extraction method of analysis field 3, it mentions below.
0091[0047] Extract a plurality of stations in subject-of-search field 2 first (Step S31). The extraction method of a plurality of stations is as being shown below. the start -- a figure -- it is shown in 18 -- as -- subject of search The outer wall of field 2 is divided into a plurality of blocks (outer wall 31 -- 38). Next, be divided and curve. One station is arranged to the outer wall of Re. Under the present circumstances, it is desirable for the transmissivity of a windowpane part etc. and an electric wave to arrange in a large position also in each outer wall. Figure To 19, it can set at this example. Station 21 -- Arrangement of 28 is shown.
0092[0048] Next, station 21 -- Station 21 of the electric wave emitted from source 1 of transmission in each of 28 -- It asks for the received power in 28 by real measurement (Step S32). Station 21 -- It is the received power which was able to be found in 28, respectively Pr_21 -- It is referred to as Pr_28.
0093[0049] About extraction of an analysis field, it is the same as that of the example of The 2, and is an investigation pair as analysis field 3. The same field as elephant field 2 is extracted (Step S33). Next, the source of false transmission for imitating the electric wave propagation environment searched for at Step S32 is arranged (Step S34). Under the present circumstances, it is preferred to arrange the source of false transmission so that it may correspond to 1 to 1 to the station set up at the step of The 1. It is false transmission to the position which separated only a fixed distance from the outer wall of a subject-of-search field. It is preferred to arrange a source. Figure Source [ in / to 20 / this example ] 101 of false transmission -- 108 Arrangement is shown. Station 21 which is on the outer wall of a subject-of-search field in this example -- Fixed from 28 To the position which detached only distance d, it is source 101 of false transmission. -- 108 has been arranged.
0094[0050] Next, determine the transmission power of the arranged source of false transmission (Step S35). source 10 of false transmission 11 -- the transmission power (Pt_n; n = 101 -- 108) of 108 is given by the following formulas.
0095Pt_n =Pr_20-/Loss (d) .... (4)
0096Here, Loss (d) is station 21. -- Source 101 of false transmission corresponding, respectively from 28 -- It is the propagation loss in distance d to 108, and can be found by the propagation loss theoretical formula of free space.
0097[0051] Source 101 of false transmission arranged at Step S34 -- 108 is made into the new source of transmission, and electric wave propagation presumption is performed for analysis field 3 (Step S 36). Figure The key map of electric wave propagation presumption at this step is shown in 21. It is Rey Tracy in order to presume the propagation environment of subject-of-search field 2 with high precision in and this example as well as the portion concerned in the example of The 1, or the example of The 2. The lei Running method which is one of the Tongue methods is used. Under the present circumstances, the station corresponding to each source of false transmission as a radial direction of a lei represents, and it limits only to The outer wall. Example The lei radial direction of For example and source 101 of false transmission is limited only to outer wall 31.
0098Example 4
0099[0052] Describe the example of The 4 of the present invention. the field assumed in this example, the source of transmission of a radio system, and a subject-of-search field -- a figure -- it is considered as the same thing as what was shown in 1. Figure 22 is this example. It is a flow chart which shows operation. In this example, analysis field 3 is a subject-of-search territory. It is the same as that of region 2. About the extraction method of analysis field 3, it mentions below.
0100[0053] Outer wall 31 which is the same as that of the portion concerned in the example of The 3, and was divided into plurality about extraction of the station of this example -- It is station 21 to each of 38. -- 28 is arranged (Step S41). Next, station 21 -- Electricity emitted from source 1 of transmission in each of 28 Station 21 of a wave -- Reception corresponding to the electric wave arrival directions in 28, and the above-mentioned electric wave arrival directions Electric power is found by real measurement (Step S42). In order to measure even the arrival directions of an electric wave Powerful directive antennas, such as an array antenna, may be used. a figure -- 23 -- station 211 -- an arrow shows the electric wave arrival directions which were able to be found in 28, and corresponding received power (Pr_21_l -- Pr_28_2) is shown.
0101[0054] Extract the field are the same as that of the example of The 2 and The 3, and same as analysis field 3 as subject-of-search field 2 about extraction of an analysis field (Step S43). Next, source 101-1 of false transmission for imitating the electric wave propagation environment searched for at Step S42 -- 108 -- 2 is arranged (Step S44). under the present circumstances -- making it correspond to 1 to 1 to the electric wave arrival directions for which it asked at Step S42 -- each -- Near the line top of electric wave arrival directions, the source of false transmission is arranged from a station. Subject of search with preferred arranging the source of false transmission in the position which separated only a fixed distance from the outer wall of a field. Figure Source [ in / to 24 / this example ] 101 of false transmission -- 1 -- 108 -- Arrangement of 2 is shown. Such By arranging the source of false transmission, it is with high precision about the attainment direction of the electric wave to a subject-of-search field. It can imitate. [0055] Next, determine the transmission power of the arranged source of false transmission (Step S45). source 10 of false transmission 1 -- 11 -- 108 -- The transmission power (Pt_n_m; n = 101 -- 108, m= l, 2) of 2 is given by the following formulas.
0102Pt_n_m = Pr_n_m ZLoss and a (5)
0103here -- Loss (d) -- station 21 -- source 101 of false transmission corresponding, respectively from 28 -- 11 -- 1 08 -- it is the propagation loss in distance d to 2 -- the propagation loss theoretical formula of free space -- Seek.
0104[0056] And it is the same as that of Step S36 in the example of The 3, and the following step S46 is false. Source 101-1 of transmission -- 108 -- 2 is made into the new source of transmission, and electric wave propagation presumption is performed by the lei Running method for analysis field 3. Figure To 25, it is a key map of electric wave propagation presumption at this step. It is shown. Under the present circumstances, station corresponding to each source of false transmission as a radial direction of a lei It limits only to the represented outer wall. For example, source 101 of false transmission -- Lei radial direction of 1 It limits only to outer wall 31.
0105[0057] In addition in the example of The 3, and the example of The 4, it is station 21 at Step S32 and S42. -- Received power Pr_21 of 28 -- It is although real measurement was used when presuming Pr_28, Besides this, you may ask for the received power of station 20 with the ray tracing method.
0106Example 5
0107[0058] Describe the example of The 5 of the present invention. the field assumed in this example, the source of transmission of a radio system, and a subject-of-search field -- a figure -- it is considered as the same thing as what was shown in 1. Figure 26 is this example. It is a flow chart which shows operation. In this example, analysis field 3 is a subject-of-search territory. It is the same as that of region 2. About the extraction method of analysis field 3, it mentions below.
0108[0059] Outer wall 31 which is the same as that of Step S31 in the example of The 3 and The 4, and S41, and was divided into plurality about extraction of the station in Step S51 of this example -- It is station 21 to each of 38. -- 28 is arranged. next, station 21 -- in each of 28 -- transmission station 21 from source 1 -- every multipass ingredient of the electric wave which arrives at 28 -- received power and electric wave arrival directions and the imaging method which is kinds of the ray tracing method about electric wave arrival time -- Demand -- To (Step S 52).
0109[0060] a figure -- 27 -- station 21 -- An arrow shows the electric wave arrival directions which were able to be found in 28, and corresponding received power (Pr_21_l -- Pr_28_2) and electric wave arrival time (Tr_101_l -- Tr_108_2) are shown.
0110[0061] That the following step S53 and S54 are the same as that of Step S43 in the example of The 4, and S44, and extraction of analysis field 3 and source 101-1 of false transmission -- 108 -- 2 is arranged. a figure -- 28 -- this operation source 101 of false transmission in an example -- 11 -- 108 -- Arrangement of 2 is shown. Sending of each source of false transmission (5) types determine Power (Step S55).
0111[0062] Source 101 of false transmission arranged at Step S54 in the following step S56 -- 1 -- 108 -- New in 2 It is considered as the source of shelf transmission, and electric wave propagation presumption is performed for analysis field 3. Under the present circumstances, the delay corresponding to the arrival time delay obtained at Step S52 each lei source Power ゝ of false transmission emitted It is given. Figure The key map of electric wave propagation presumption at this step is shown in 29. Fruit of The 1 1 The 4 This example as well as the portion concerned in the example of Application is high energy about the propagation environment of subject-of-search field 2. In order to presume to a degree, the lei Running method which is one of the ray tracing methods is used.
0112[0063] Consider it as the radial direction of a lei like Step S36 in the example of The 3 and The 4, and S46. The is limited only to the outer wall which the station corresponding to each source of false transmission represents. For example, the lei radial direction of source 101-1 of false transmission is limited only to outer wall 31.
0113[0064] As for the flow of operation in each example mentioned above, it is natural that it memorizes to recording media (figure 5 memories 50), such as ROM, beforehand, and can make it perform by making CPU which is a computer read this as a program.
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Numbers
- Publication
- 2005/088868
- Publication, DOCDB
- 2005088868
- Publication, EPODOC
- WO2005088868
- Application
- 4764
- Application, DOCDB
- 2005004764
- Application, EPODOC
- WO2005JP04764
Titles2
- English
- ELECTRIC WAVE PROPAGATION CHARACTERISTIC ESTIMATION SYSTEM, METHOD THEREOF, AND PROGRAM
- French
- SYSTÈME D'ÉVALUATION D'UNE CARACTÉRISTIQUE DE PROPAGATION D'UNE ONDE ÉLECTRIQUE, PROCÉDÉ DUDIT SYSTÈME ET PROGRAMME
Classification
- CPC, 1
- H04B17/3912
- IPC, 6
- G01R29 08
- H04B7 26
- H04B17 00
- H04B17 391
- H04W24 00
- H04W24 06
Designated states4
- Regional, 4
- Zimbabwe
- Turkmenistan
- Türkiye
- Togo